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1H NMR study on the motion of NH4+ in ferroelectric NH4H(ClH2CCOO)2 and mixed (NH4)1-xRbxH(ClH2CCOO)2 (x=0.15).
Autorzy
Rok wydania
2002
Czasopismo
Zeitschrift für Naturforschung Section A: A Journal of Physical Sciences
Numer woluminu
57a
Strony
883-887
DOI
10.1515/zna-2002-1107
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Temperature-dependent proton NMR relaxation time measurements have been performed at 60 MHz in order to study the NH4+ dynamics in ferroelectric NH4H(ClH2CCOO)2 and mixed Rbx(NH4)1-x(ClH2CCOO)2, where x = 0.15. The data indicate that the dominant relaxation mechanism for the NMR spin-lattice relaxation time T 1 in both crystals involves simultaneous NH4 group reorientation about their C2 and C3 symmetry axis in the paraelectric phase. Details of the NH4+reorientation have been inferred from analysis of temperature dependence of T1 assuming the Watton model. The activation parameters of the motionshave been determined.It has been found that the substitution of Rb does not change the activation parameters of the NH4 group dynamics.
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